<template>
    <div>
      <!--面包屑导航区-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>
      <!--卡片视图区域-->
      <el-card>
        <!--警告区域-->
        <el-alert
          title="注意：只允许为第三级分类添加相关参数！"
          type="warning" show-icon :closable="false">
        </el-alert>
        <!--选择商品分类区域-->
        <el-row class="cat_opt">
          <el-col>
            <span>选择商品分类：</span>
            <!--选择商品分类的级联选择框区域-->
            <!-- options：指定数据源-->
            <!-- props：指定配置对象-->
            <el-cascader
              v-model="selectedCateKeys" :props="cateProps"
              :options="cateList"
              @change="handleChange"></el-cascader>
          </el-col>
        </el-row>
        <!-- tab 页签区域-->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <!--添加动态参数的面板-->
          <el-tab-pane label="动态参数" name="many">
            <!--添加动态参数的按钮-->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
            <!--动态参数表格-->
            <el-table :data="manyTableData" border stripe>
              <!--展开列-->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!--循环渲染Tag标签-->
                  <el-tag v-for="(item,i) in scope.row.valueList" v-bind:key="item.id" closable @close="handleClose(i,item,scope.row)">{{item.attributeVal}}</el-tag>
                  <!--输入文本框-->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)">
                  </el-input>
                  <!--添加Tag按钮-->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!--索引列-->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="name"></el-table-column>
              <el-table-column label="操作" >
                <template slot-scope="scope">
                  <el-button type="primary"  icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.id)" >编辑</el-button>
                  <el-button type="danger"  icon="el-icon-delete" size="mini" @click="removeParams(scope.row.id)" >删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
          <!--添加静态属性的面板-->
          <el-tab-pane label="静态属性" name="only">
            <!--添加静态属性的按钮-->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
            <!--静态属性表格-->
            <el-table :data="onlyTableData" border stripe>
              <!--展开列-->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!--循环渲染Tag标签-->
                  <el-tag v-for="(item,i) in scope.row.valueList" v-bind:key="item.id" closable @close="handleClose(i,item,scope.row)">{{item.attributeVal}}</el-tag>
                  <!--输入文本框-->
                  <el-input
                    class="input-new-tag"
                    v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)">
                  </el-input>
                  <!--添加Tag按钮-->
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                </template>
              </el-table-column>
              <!--索引列-->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称" prop="name"></el-table-column>
              <el-table-column label="操作" >
                <template slot-scope="scope">
                  <el-button type="primary"  icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.id)" >编辑</el-button>
                  <el-button type="danger"  icon="el-icon-delete" size="mini" @click="removeParams(scope.row.id)" >删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
      </el-card>
      <!--添加参数/属性的对话框-->
      <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%" @close="addDialogClosed">
        <!--添加参数的对话框-->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
          <el-form-item :label="titleText" prop="name">
            <el-input v-model="addForm.name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
      </el-dialog>
      <!--修改参数对话框-->
      <el-dialog
        :title="'编辑' + titleText"
        :visible.sync="editDialogVisible"
        width="50%" @close="editDialogClosed">
        <!--添加参数的对话框-->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
          <el-form-item :label="titleText" prop="name">
            <el-input v-model="editForm.name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
      </el-dialog>
    </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      cateList: [],
      cateProps: {
        value: 'id',
        label: 'name',
        children: 'children',
        expandTrigger: 'hover',
        checkStrictly: 'false'
      },
      // 级联选择框选中的key
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数列表
      manyTableData: [],
      // 静态参数列表
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        name: ''
      },
      addFormRules: {
        name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制编辑对话框的显示与隐藏
      editDialogVisible: false,
      // 编辑的表单数据对象
      editForm: {},
      // 编辑的表单数据对象
      editFormRules: {
        name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      }
    }
  },
  created() {
    this.getParamCateList()
  },
  methods: {
    // 获取商品分类列表
    async getParamCateList() {
      const result = await this.$http.get('/category/getList', { params: { type: 3 } })
      if (result.data.code !== 200) {
        return this.$message.error('获取分类列表失败')
      }
      this.cateList = result.data.data
    },
    // 级联选择框选中项变化，会出发这个函数
    handleChange() {
      this.getParamData()
    },
    // 页签点击事件的处理函数
    handleTabClick() {
      this.getParamData()
    },
    async getParamData() {
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return false
      }
      // 证明选中的是三级分类
      // 根据所选分类的id,和当前所处的面板，获取对应的参数
      const result = await this.$http.get(`/attribute/getList/${this.cateId}`, { params: { sel: this.activeName } })
      if (result.data.code !== 200) {
        return this.$message.error('获取属性失败')
      }
      if (this.activeName === 'many') {
        this.manyTableData = result.data.data
      } else {
        this.onlyTableData = result.data.data
      }
    },
    // 监听对话框的关闭事件
    addDialogClosed() {
      // 关闭清空
      this.$refs.addFormRef.resetFields()
    },
    // 点击添加按钮
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return false
        const result = await this.$http.post(`/attribute/save/${this.cateId}`, {
          name: this.addForm.name,
          sel: this.activeName
        })
        if (result.data.code !== 200) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamData()
      })
    },
    // 点击编辑按钮展示修改对话框
    async showEditDialog(id) {
      // 查询当前参数的信息
      const result = await this.$http.get(`/attribute/getOne/${this.cateId}/${id}`, { params: { sel: this.activeName } })
      if (result.data.code !== 200) {
        return this.$message.error('获取参数信息失败')
      }
      this.editForm = result.data.data
      this.editDialogVisible = true
    },
    // 监听对话框的关闭事件
    editDialogClosed() {
      // 关闭清空
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return false
        const result = await this.$http.put(`/attribute/UpdateOne/${this.cateId}/${this.editForm.id}`, {
          name: this.editForm.name,
          sel: this.activeName
        })
        if (result.data.code !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.getParamData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除对应的参数项
    async removeParams(id) {
      // 弹框提示是否删除权限
      const result = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 如果用户确认删除，则返回字符串 confirm
      // 如果用户取消删除，则返回字符串 cancel
      if (result !== 'confirm') {
        return this.$message.info('已取消删除')
      }
      const res = await this.$http.delete(`/attribute/delete/${this.cateId}/${id}`)
      if (res.data.code !== 200) {
        return this.$message.error('删除参数失败！')
      }
      this.$message.success('删除参数成功')
      this.getParamData()
    },
    // 文本框失去焦点或者回车键 触发
    async handleInputConfirm(row) {
      // 如果输入不合法的内容直接返回并清空
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return false
      }
      // 需要发起请求，保存这次操作
      const result = await this.$http.put(`/attribute/saveValue/${row.id}`, { attributeVal: row.inputValue.trim() })
      if (result.data.code !== 200) {
        return this.$message.error('添加参数项失败！')
      }
      // 如果没有返回，说明输入了合理的内容，可进行后续处理
      row.valueList.push({ attributeVal: row.inputValue.trim() })
      row.inputValue = ''
      // 隐藏输入框
      row.inputVisible = false
      this.$message.success('添加参数项成功！')
    },
    // 点击按钮，展示文本输入框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作用：当页面上元素被重新渲染之后(点击之后的输入框就是重新渲染的)，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    async handleClose(i, valbody, row) {
      // 需要发起请求，保存这次操作
      const result = await this.$http.put(`/attribute/deleteValue/${row.id}`, { id: valbody.id, attributeVal: valbody.attributeVal })
      if (result.data.code !== 200) {
        return this.$message.error('删除参数项失败！')
      }
      row.valueList.splice(i, 1)
      this.$message.success('删除参数项成功！')
    }
  },
  // 计算属性
  computed: {
    // 如果按钮需要被禁用，则返回true
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的Id
    cateId () {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt{
  margin: 15px 0;
}
.el-tag{
  margin: 10px;
}
.input-new-tag{
  width: 120px;
}
</style>
